Method of forming cam levers



Oct. 20, 1936. c. E. BUDD 2,057,705

METHOD OF FORMING CAM LEVERS Filed Sept. 28, 1953 2 Sheets-Sheet 1 IN V EN TOR.

, Clarence fjudd BY Q. 60;:

' ATTORNEY Oct. 20, 1936. c, E BUDD 2,057,705

METHOD OF FORMING CAM LEVERS Filed Sept. 28, 1933 2 Sheets-Sheet 2 INVENTOR. C/arence E fiuda' A TTORNEY.

Patented Oct. 20, 1936 lTED STATES PATENT OFFICE METHOD OF FORMING CAM LEVERS Application September 28, 1933, Serial No. 681,361

1 Claim.

This invention relates to vehicle brakes and elements thereof, and. most particularly to processes for forming a cam lever which is one of the brake elements.

An object is to cheapen the cost of the cam lever.

Further objects and features of the invention will be apparent after a reading of the subjoined specification and claim, and after a consideration of the accompanying drawings in which:

Figure 1 is a view in section of a brake illustrating my invention;

Figure 2 is a view in perspective of a cam lever forming a part of the brake assembly;

Figure 3 is a view in section of a rolled plate used in the processof forming the lever shown in Figure 2;

Figure 4 is a view in plan of a plate such as that of Figure 3, showing a lever sheared from the plate and showing in dotted lines how other levers may be sheared or stamped therefrom.

Figure 5 is a sectional view along the line 5-5 of Figure 1, showing the anchor bracket;

Figure 6 is a View in side elevation of a stamping forming a portion of the anchor bracket; and

Figure '7 is a view in side elevation showing a forging forming another portion of the anchor bracket.

Referring in detail to the drawings, it may be seen that I have illustrated a brake including a drum II], a backing plate I2, and a pair of brake shoes I4 and I6.

The shoes are adapted to be spread into contact with the drum ID by means of a cam lever l8, which is formed with a pair of lugs and. 22 interposed between the ends of the shoes and with a cut out portion 23 surrounding a pin 24 against which the ends of the shoes rest in the off position of the brake. The lever I8 is formed at the end thereof opposite to the lugs 20 and 22 with a hook 26 connected to a tension "element 28 by means of which the brake is operated. The levers are formed with ridges 54 and 56 which serve to support and position the lever between the rib of the shoe I4 and the backing plate I2. A lateral offset is provided near the hook end of the lever to provide clearance between the lever and the shoe rib so that the clevis on the end of the tension member 28 may engage the lever and operate freely.

The opposite ends of the shoes I4 and I6 are pivo-tally connected to pointed strut links 30 and 32 respectively. The links are guided by a housing formed by a stamping 34 and a forging 36, and at their pointed ends bear upon a wedge 38. The forging 36 is formed with a pair of grooved lugs 35 and 31, the grooves coacting with the roof of the stamping 34 to form a pair of cylindrical guideways for the strut links 30 and 32. The Wedge may be screwed in or out of a bore formed in a boss 4| on the forging 36, in order to adjust the position of the shoes. The forging 36 is riveted to the backing plate I2 and the stamping is secured to the forging as by welds 42. Thus it may be seen that in the braking operation, the shoe which does most of the braking anchors through its strut link on the wedge 38 and thence through the forging 36 on the backing plate I2.

The construction described above is claimed in my divisional application No. 62,399, filed February 5, 1936.

Springs 44 and 46 are provided for returning the shoes to the normal released position when tension on the element 28 is relieved.

It is believed that the operation of my improved brake will be obvious from the above description. When the operator desires to apply the brakes, he pulls on the tension element 28, thus rocking the lever I8 and spreading the shoes I4 and I6. The lever l8 may float with the movement of the shoes I4 and I6. The shoes anchor as described above through the adjustable wedge 38. When necessary to adjust the shoes on account of lining wear or otherwise, the wedge 38 may be screwed in to spread the anchor ends of the shoes.

I prefer to form the cams I8 in the following manner: I roll a sheet of metal 52 to the form shown in Figure 3, thus forming the ridges 54, 56, and 58. Thereafter I shear the levers one after the other from the rolled sheet of metal. Thus the lever I8 may be sheared as from 60 and additional levers may be sheared as at 62 and 64. Simultaneously with the shearing of each lever I8, I shear the cut out portion 23.

It is to be understood that the above described embodiments of my invention are for the purpose of illustration only, and various changes may be made therein without departing from the scope of the invention.

I claim:

The process of forming cam levers, which comprises rolling a sheet of metal to a desired section with a relatively large ridge at one end, a pair of smaller ridges on opposite sides and out of alignment adjacent the center thereof, and a slightly offset portion adjacent to the opposite end and thereafter shearing a series of levers therefrom, and simultaneously with the shearing of each lever, shearing a cut out portion from the central part of the ridged end of the lever and forming a hook on the other end.

CLARENCE E. BUDD. 

